Money found on legal salvage seems Heaven-sent to a young mariner who just inherited a gutted business ? until its criminal owners target his friends and family in the close-knit coastal town.

You have most of it here, but I feel that it needs one more item.. the action. What is the young mariner going to do to remedy the situation? You have the inciting indecent and the issue that it causes, but no hint as to how the hero will resolve it. Maybe something like:
"After a young mariner hauls in a valuable salvage, it's criminal owners disrupt his small coastal town unless he can _________"
Fill in with what he does or tries to do..

Cool concept, I hope it works out. Good luck!

It's really good! Congrats!